al salam alaikum wa rahmat allah wa baraktu, my question is about the Isha prayer. I don't know why did the prophet say that if it were not hard on my people I would have ordered them to delay Isha prayer.
When I am out of my house and the time of Esha prayer starts, can I delay the prayer till I returned to the house before 12 p.m.
Tell me please about the prayer of al Fajr, can it be prayed after al Sobh prayer? My third question is about the shafea and witr prayers, tell me more about them .

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

My dear brother, you should know that the prayers have their specified fixed times. Allah Says (what means): {Indeed, prayer has been decreed upon the believers a decree of specified times.} [Quran 4:103]

All prayers have two kinds of times:

A- Preferred Time.

B- Permissible Time.

The Sunnah always urges Muslims to perform the prayer at its specific time. Ibn Mas’ood asked the Prophet said: “Which deeds are the best? He replied: “Performing the prayer at its prescribed fixed times." He asked, then what? He (the Prophet) replied: “Being kind and dutiful to the parents.” He asked, then what? He replied: “Jihaad for the sake of Allah.”
Women and men are equal concerning prayer times and common religious principles.

The Prophet was not used to sleeping before ‘Isha nor to nightly chat except in necessity times. My dear brother, try hard and perform all prayers with congregation. May Allah protect you. We do not know any prayer by the name of “Subh” prayer. It seems that you mean the Fajr prayer. The time of Fajr prayer is well known. The time for the Fajr prayer begins at true dawn and ends at sunrise, though the preferred time for it ends when it becomes light outside, after which the merely permissible time remains. This prayer is one of the two prayers, which are very hard for hypocrites. Do not miss the time of the prayer. The Witr prayer is three Rak'ahs after performing ‘Isha prayer and its Sunnah prayers. You pray two Rak'ahs: in the first Rak'ah, it is preferable to recite Soorah A’la [Quran 87] and Soorah Al-Kafiroon [Quran 109] in the second. After finishing your prayer with Salaams, this is Shaf'; then you start praying one Rak'ah, which is Witr: after reciting Al-Faatihah, it is preferable to recite Soorah Al-Ikhlas [Quran 112]. But you may recite any part of the Quran. After straightening up from Rukoo’ (bowing down position), you may supplicate, if you wish and you may ask from Almighty Allah what you need. The Witr prayer is a confirmed Sunnah; the Prophet did not miss it neither in his journey nor his residency. At the same time a person should not forget the night prayer (Tahajjud).

Allah knows best.